Papagno, Marco and Pacile, Daniela and Topwal, Dinesh and Moras, Paolo and Sheverdyaeva, Polina Makarovna and Natterer, Fabian Donat and Lehnert, Anne and Rusponi, Stefano and Dubout, Quentin and Calleja, Fabian and Frantzeskakis, Emmanouil and Pons, Stephane and Fujii, Jun and Vobornik, Ivana and Grioni, Marco and Carbone, Carlo and Brune, Harald (2012) Two distinct phases of bilayer graphene films on Ru(0001). ACS Nano, 6 (10). pp. 9299-9304. ISSN 1936-0851

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By combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy we reveal the structural and electronic properties of multilayer graphene on Ru(0001). We prove that large ethylene exposure allows the synthesis of two distinct phases of bilayer graphene with different properties. The first phase has Bernal AS stacking with respect to the first graphene layer and displays weak vertical interaction and electron doping. The long-range ordered moire pattern modulates the crystal potential and induces replicas of the Dirac cone and minigaps. The second phase has an AA stacking sequence with respect to the first layer and displays weak structural and electronic modulation and p-doping. The linearly dispersing Dirac state reveals the nearly freestanding character of this novel second-layer phase.

Item Type: Article
Uncontrolled Keywords: multilayer graphene; Ru; stacking sequence; photoemission; STM
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Jan 2013 07:35
Last Modified: 16 Jan 2013 07:35

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